Indian buyers encounter silver weights in grams, kilograms and tola, while international market news uses troy ounces. Confusing these units can create apparent price disagreements even when two sources are referring to the same amount of silver. Before converting a rupee figure, decide whether you are converting mass, a 999 benchmark or a retail jewellery invoice: the first is pure arithmetic, but the second and third also require attention to purity, date and charges.
The essential silver weight conversions
The international precious-metal trading convention uses the troy ounce, not the ordinary everyday ounce. The London Bullion Market Association (LBMA) states that one troy ounce equals exactly 31.1034768 grams. The commonly used Indian subcontinental tola is approximately 11.6638 grams; an Indian government reference table also uses that rounded figure.
| Weight unit | Approximate grams | What to remember |
|---|---|---|
| 1 gram | 1 g | Basic metric unit |
| 10 grams | 10 g | Common small-product size |
| 1 tola | 11.6638 g | Confirm the seller's definition |
| 1 troy ounce | 31.1034768 g | Precious-metal international unit |
| 100 grams | 100 g | One-tenth of a kilogram |
| 1 kilogram | 1,000 g | IBJA silver benchmark unit |
One troy ounce is not 28.35 grams. That smaller figure refers to the ordinary avoirdupois ounce. A 1 kg silver quantity represents approximately 32.1507465 troy ounces, using the LBMA's accepted market conversion. Similarly, 10 tola ≈ 116.638 grams, not 100 grams. If a retail listing loosely calls 10 grams 'one tola', insist that the bill state the actual measured gram weight.
How to convert an IBJA kilogram rate
The India Bullion and Jewellers Association publishes its Silver 999 benchmark in rupees per kilogram, with dated sessions and an explicit statement that the rates exclude GST and making charges. Let K be the published per-kilogram reference in rupees:
- 1 gram reference = K ÷ 1,000.
- 10 grams reference = K × 10 ÷ 1,000.
- 1 tola reference ≈ K × 11.6638 ÷ 1,000.
- 1 troy ounce reference = K × 31.1034768 ÷ 1,000.
- 100 grams reference = K × 100 ÷ 1,000.
Keep full precision during the calculation and round the final displayed amount. Multiplying an already-rounded one-gram card by 1,000 can differ slightly from the original kilogram figure. That is a rounding artefact, not evidence of a separate underlying market quote.
A simple example that is not today's rate
To make the arithmetic easy, imagine a hypothetical Silver 999 benchmark of ₹100,000 per kilogram. This is a constructed teaching number, not a current Indian rate. It translates to ₹100 per gram, ₹1,000 per 10 grams, approximately ₹1,166.38 per tola and approximately ₹3,110.35 per troy ounce. The conversion changes only the amount of metal represented, not the purity or tax basis.
If the item is a 925 bracelet rather than 999 reference silver, an extra fineness comparison is necessary. The actual shop invoice may then add making charges, a product premium and GST. Do not take the converted tola amount as a guaranteed dealer selling or buyback price.
How to compare a dollar-per-ounce headline with rupees per kilogram
An international news headline may express silver in USD per troy ounce. To obtain a mathematical INR-per-kilogram equivalent, first multiply by the applicable USD/INR exchange rate, then multiply by 1,000 ÷ 31.1034768. Conversely, dividing an INR-per-kilogram number by that mass factor gives INR per troy ounce.
Both calculations require the same timestamp to be meaningful. They also omit the differences between international spot, Indian benchmarks, MCX futures contracts and retail costs. A conversion formula is not an arbitrage guarantee and does not manufacture an official India market rate from an overseas headline.
Why purity matters when converting prices
A gram is always a gram of total mass, but two grams of silver products need not contain the same amount of silver. For example, 10 grams of 925 alloy contains 9.25 grams of silver, whereas 10 grams of 999 alloy contains 9.99 grams. Both objects weigh 10 grams on a scale. Their metal content differs even before a retailer adds design or fabrication costs.
Use our existing 925 vs 999 silver explanation alongside the grams and kilograms guide. The silver calculator is also available when you want to test a stated weight and purity against a dated reference.
Frequently asked questions
How many grams are in one tola of silver?
The commonly used standard tola is approximately 11.6638 grams. Confirm the invoice's actual gram weight if a seller uses a rounded or informal description.
Is one ounce of silver 28 grams or 31.1 grams?
Precious metals typically use the troy ounce, exactly 31.1034768 g. The everyday avoirdupois ounce is about 28.3495 g and should not be substituted silently.
How many troy ounces are in one kilogram?
Approximately 32.1507465 troy ounces, using the accepted LBMA conversion.
Do conversions include GST and making charges?
No. Weight conversions do not add or remove tax, retailer margin or manufacturing cost. IBJA's benchmark is published before GST and making charges.
Sources and verification
- LBMA: Troy-ounce and kilogram conversion factors.
- LBMA: Understanding the precious-metal price unit.
- Government of Maharashtra: Reference conversion table including one tola.
- IBJA: Silver 999 kilogram rate, sessions and tax exclusions.
Reviewed 8 October 2026. This article explains mass conversion only; price illustrations are hypothetical and not investment advice.
